nginx中的break和last

示例1-无break和last

请求：访问/1.html
结果：最终会匹配到b.html
执行顺序：连续执行两次rewrite后，匹配到location /3.html，最终匹配到b.html

server{
    listen 80; 
    server_name test.com;
    root /tmp;
    
    location / {
        rewrite /1.html /2.html;
        rewrite /2.html /3.html;
    }
    location /2.html
    {
        rewrite /2.html /a.html;
    }
    location /3.html
    {
        rewrite /3.html /b.html;
    }
}

示例2-break在location外

请求：访问/1.html
结果：最终返回403
执行顺序：因为rewrite后有break，所以不再匹配后面的rewrite了，但会继续匹配后面的location。

server{
    listen 80; 
    server_name test.com;
    root /tmp;

    rewrite /1.html /2.html break;
    rewrite /2.html /3.html;
    location /2.html {
        return 403;
    }
}

示例3-break在location中

请求：访问/1.html
结果：最终得到2.html
执行顺序：在location块中匹配到rewrite /1.html /2.html break;后不再执行任何语句，包括当前location块中的语句。

server{
    listen 80; 
    server_name test.com;
    root /tmp/123.com;
    
    location / {
        rewrite /1.html /2.html break;
        rewrite /2.html /3.html;
    }
    location /2.html
    {
        rewrite /2.html /a.html;
    }
    location /3.html
    {
        rewrite /3.html /b.html;
    }
}

示例4-last

请求：访问/1.html
结果：最终得到a.html
执行顺序：遇到了last的后，会再次进行匹配，最终得到a.html。

server{
    listen 80; 
    server_name test.com;
    root /tmp/123.com;
    
    location / {
        rewrite /1.html /2.html last;
        rewrite /2.html /3.html;
    }
    location /2.html
    {
        rewrite /2.html /a.html;
    }
    location /3.html
    {
        rewrite /3.html /b.html;
    }
}